JPS5926830A - Elevator type paper feed mechanism - Google Patents

Abstract

PURPOSE:To securely feed paper by supporting a feed roller shaft at a position where the driving force of the feed roller does not affect paper feed pressure acting on the paper on a paper feed bench. CONSTITUTION:A shaft supporting member for supporting the shaft 36 of a paper feed roller 27 is provided for said paper feed roller 27 so as to be followable to a most upper paper level, and the supporting point of a shaft supporting point and the supporting point 43 of the shaft are provided on said supporting member on a line along the direction of the resultant force between paper feed reaction oppositely acting on the roller to a feed paper roller 27 peripheral surface moving direction in a paper feed roller 27 tangential direction at a contact portion between the paper feed roller 27 and the paper and paper treating reaction acting on the roller in the opposite direction to roller peripheral surface moving direction in the paper feed roller 27 tangential direction at the contact position of the roller with a treating member 28. Accordingly, it is possible to feed paper regardless of the loadage of the paper.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an elevator type paper feeding mechanism, and more particularly, to
The present invention relates to an elevator-type paper feeding mechanism in which paper stacked on a paper feeding table that is movable in the vertical direction is fed one by one by a paper feeding roller to a paper processing unit that performs processing such as printing.

Conventionally, in automatic mimeograph machines, etc., the paper feed mechanism that feeds sheets of paper to be printed one by one to the printing mechanism has been the one shown in Fig. 1, which uses a spring or the like to push up the paper feed tray on which the sheets are placed. , the one shown in FIG. 2 in which the paper feed table is pushed up by a motor or the like is known.

That is, the paper feed mechanism shown in FIG. 1 rotatably supports a paper feed table 2 on which paper 1 is placed on a fulcrum 3, and pushes the paper feed table 2 with a spring (not shown) or the like. 1-, press the top paper 1 against the paper feed roller 4, and press the two-sheet feed prevention 1-. The "-" paper L is passed through a guide 6 from between the paper cutting member 5 and the L distribution paper roller 4, and is fed to a printing mechanism section (not shown).

On the other hand, the paper feeding mechanism shown in FIG. The leading edge of the paper 8 is pressed against the main paper feed roller 9 and the auxiliary paper feed roller 10, and the gap between the main paper feed roller 9 and the double feed rain-proofing member 1.1 provided below the main paper feed roller 9. The sheets 8 are fed one by one to a printing mechanism section (not shown) through a guide [2].

Although the paper feeding mechanism in Figure 1 has a relatively simple configuration,
In this paper feeding mechanism, as the paper 1 is stacked (6), the angle α between the guide 6 and the topmost paper 1 changes by 1, so that the paper feed roller 4 acts on the topmost paper 1. The pressure (sheet feeding pressure) changes, and it is not possible to load more than a certain number of sheets 1 on the sheet feeding tray 2.

On the other hand, in the paper feeding mechanism shown in Fig. 2, the paper feeding tray 7 is raised in steps by a motor, so the paper feeding pressure is not constant.If this paper feeding pressure is too weak, paper feeding will not occur; If it is too strong, double feeding or wrinkles will occur in the paper 8. For this reason, in the paper feeding mechanism shown in FIG. 2, the paper feeding pressure applied from the main paper feeding roller 9 to the uppermost paper 8 is weakened, and an auxiliary paper feeding roller IO is added to assist paper feeding. The rotation of this auxiliary paper feed roller lO serves as an auxiliary motor for pushing up the paper feed tray 7; Paper feed roller 1
In addition, the distance d between the main paper feed roller 9 and the auxiliary paper feed roller 10 causes slippage between the main paper feed roller 9 and the paper 8. If there is, there is a problem that the paper 8 is wrinkled, and the paper feeding mechanism is also complicated.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to prevent the driving force of the paper feed roller from acting on the paper stacked on the paper feed tray from the paper feed roller in the conventional elevator type paper feed mechanism. By supporting the shaft of the paper feed roller at a position that does not affect the paper feed pressure, the paper feed pressure applied to the paper is constant regardless of the level of the topmost paper, and the paper loading order can be adjusted with a simple structure. The aim is to ensure that the paper is fed to the paper processing section regardless of the situation.

For this reason, the present invention stacks sheets of paper on a paper feed table that is movable in the vertical direction, lifts the paper feed table in a stepwise manner, and presses the leading edge of the topmost sheet of paper against a paper feed roller. In the elevator-type paper feeding mechanism that feeds the paper sheets one by one to the paper processing section from between this paper feeding roller and a double-feed protection member provided at the lower part of the paper feeding roller, the paper feeding mechanism A shaft support member is provided to support the shaft of the recording paper feed roller so that the roller can follow the level of the uppermost paper, and the shaft support member is provided with a solenoid.
1. A paper feed reaction that acts in the tangential direction of the paper feed roller at the contact portion between the paper feed roller and the paper in a direction opposite to the direction of movement of the circumferential surface of the paper feed roller; ” - support of the shaft support member on a line along the direction of the resultant force of the Sabaki reaction acting in the tangential direction of the paper feed roller in the direction opposite to the direction of movement of the peripheral surface at the contact portion with the Zabaki member; It is characterized by providing a point and a fulcrum of the shaft.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to drawings showing an embodiment in which the present invention is applied to an automatic mimeographing machine.

As shown in FIG. 3, the automatic mimeographing machine includes a paper feed mechanism 21 according to the present invention, and a paper processing unit that performs mimeograph printing on the paper fed one by one from the paper feed mechanism 21. The paper feeding mechanism 21 and the printing mechanism 22 are housed in one exterior case 23.

The feed M1 mechanism 21 includes a paper feed table 2 that is movable in the vertical direction.
4. Motor 25 that drives the paper feed tray 24; the paper feed tray 2;
A paper feed roller 27 that feeds the printing paper 26 loaded on the paper 4 to the printing mechanism 22, and a rubber rubber 2 for preventing IJ from feeding two sheets of paper 26 fed by the paper feed roller 27.
8, the Sabaki rubber support base 29 supporting the paper feed roller 2
Roller 3 that sends paper 26 from 7 to J2 printing mechanism 22
It consists of 1, 32 mag.

The paper feed tray 24 has rack gear-equipped columns 33 (only one is shown in FIG. 3) provided on both sides thereof, and side plates of the paper feed tray 24 that sandwich the rack gear attached columns 33 from both sides. Guide roller 3 rotatably provided on 24a
4, it is supported so as to be movable in the vertical direction.

A motor 25 is attached to the side plate 24a of the paper feed tray 24, and an output gear 2 attached to the output shaft 25a of the motor 25.
5I) and the rack gear portion 3 of the rack geared support column 33
A balance gear 35 provided between the paper feed table 3a and the paper feed table 3a allows the paper feed tray 24 to be driven up and down while maintaining a horizontal state using one motor 25.

On the other hand, the paper feed roller 27 has a wooden shaft 36, as shown in FIG. Fixed in the center.

One end of the shaft I-36 is connected via a universal joint 37 to one end of a drive shaft 39 rotatably supported by a bearing 38, and one end of the shaft I-36 is attached to the other end of the drive shaft 39. The gear 40 is connected to the support shaft 41
It is meshed with a segment gear 42 that is swingably supported by.

When the segment gear 42 swings in the direction of arrow Ar1, the movement is transmitted to the paper feed roller 27 through the gear 40, drive shaft 39, universal joint 37, and shaft 36, and the paper feed roller 27 swings in the direction of arrow Ar2. Rotate in the direction.

On the other hand, the other end of the shaft 36 is supported by an alignment bearing 45 provided at one end of a swing plate 44 that is swingably supported by a fulcrum 43 provided at a position described below.

The position of the fulcrum 43 of the swing plate 44 is determined as follows.

That is, when the paper feed roller 27 rotates in the direction of the arrow Ar2, the leading end of the third-most paper 26 among the sheets 26 stacked on the paper feed table 24 touches the paper feed roller 27.
As the peripheral surface of the paper 2 moves, the paper 2 is fed between the Zabaki rubber 28 and the paper feed roller 27.
No. 6 is the number 6, as shown in Fig. 5.
7, the paper feed roller 2 is moved in the tangential direction of the paper feed roller 27 at the contact portion between the paper feed roller 27 and the paper 26.
Paper feeding force F acts on the direction of movement of the peripheral surface of 7, and -
From the rebar rubber 28, the rebar force F2 acts in the direction of movement of the circumferential surface in the tangential direction of the roller 27 at the contact portion with the rebar rubber 28.

Therefore, a sabagi reaction (-F2) which has a bias on the shift Vft 36 of the paper feed roller 27 acts.

Therefore, the fulcrum 43 of the swing plate 44 is set on the straight line 4o along the paper feed reaction (-F□) and the Sabaki reaction direction, and the paper feed roller 27 is rotated in the direction of arrow A F2. The above resultant force F acting on the shaft 36 of 27
If F3 is canceled out, the paper feed pressure acting on the paper 26 from the two-stroke paper feed roller 27 will no longer be affected by the resultant force F3.

2. The paper feed pressure is determined by a paper feed pressure spring 46 stretched between the other end of the swing plate 44, the middle part of the fulcrum 43, and the metal fitting 45.
is given by the spring force of .

The other end of the swing plate 44 faces the notch 47a of an optical paper feed sensor 47 made of a photocoupler or the like, and the paper 26 is fed by the paper feed roller 27 so that the highest level of the paper 26 is When the level of the paper feed roller 27 decreases, the other end of the swing plate 44, which had been cutting off the optical path of the photocoupler (not shown) of the paper feed sensor 47, opens the optical path. There is.

The paper feed sensor 47 is connected to the swing plate 44 as described above.
When the optical path is opened, a command signal for raising the paper feed tray 24 is output to the control circuit 48.

” The second control circuit 48 is connected to the Motor 25△ only during the period when the rising command signal is input. This is the circuit that connects the power supply to the power supply.

Returning again to FIG. 3, the Zanobeki rubber support base 29 supporting the Zanobeki rubber 28 is supported by a support fitting 49 so as to be movable up and down, and is also supported by a compression spring 51. The zabaki rubber 28 is pressed against the circumferential surface of the paper feed roller 27 by applying force.

” By the rotation of the paper feed roller 27, the paper feed roller 27
The paper 26 drawn between the Zabaki rubber 28 and the Zabaki rubber 28 is caused by the Zabaki rubber F due to the friction between the Zabaki rubber 28 and the paper 26.
One by one, the guide plate 52 and the L guide plate 53 are formed by the action of 2.
These rollers 31, 32 further pass the J2 paper 26 through the guides 54, 55, and feed it between the press roller 56 of the printing mechanism 22 and the printing drum 57. to be sent in between.

. The printing mechanism 22 includes a drum motor J58 that rotates the print drum 57, a screen 59 on which a mimeograph paper (not shown) can be pasted, and a screen 59 that is stretched between the print drum 57. The detailed description of the printing press A1ζ22 will be omitted as it is not directly related to the present invention.

Note 1. In the printing mechanism 22, 62 is an ink duplex, 63 is an ink pump, 64 is an ink distributor, 65 is a cam driven by a gear 66, 67 is a drive plate that drives the ink pump 63 by the cam 65,
68 is a solenoid for releasing the engagement IJ- of the spring clutch 71 of the trigger plate 69; 72 is an ink mixing roller; 7
3 is an ink detection roller.

The paper 26 printed by the printing mechanism section 22 is guided by a guide 74 and discharged onto a paper receiving plate 56-.

The paper feed mechanism 21 of the automatic mimeographing machine is configured as shown in L, and the paper feed tray 24 is lowered by an operation switch (not shown), and after stacking the paper 26 on the paper feed tray 24, the operation switch 2 is pressed again. Operate the ration paper table 24 to 1 = "ji"
When the paper 26 at the lowest position comes into contact with the paper feed roller 27i and pushes the paper feed roller 27, the swing plate 44 moves to the position (1) as shown in FIG. The swing plate 44 blocks the optical path of the photocoupler in the paper feed sensor 4, and the paper feed sensor 47 stops outputting the raising command signal for the paper feed table 24.1. do. Therefore, the control circuit 48 in FIG. 4 stops the motor 25.

Now, if a print start switch (not shown) is turned on in the state described in -4-, the paper feed roller 27, drum motor 58, etc. will rotate.

Due to the rotation of the paper feed roller 27, the paper 26 stacked on the paper feed tray 24 is moved from the third place paper 26 to the 111ff.
Next, by the action of the paper feed roller 27 and the sabaki rubber 28, the sheets are fed one by one from the rollers 31 and 32 to the printing mechanism 22.

At this time, the paper feeding pressure acting on the uppermost paper 26 from the paper feeding roller 27 is such that, as already explained in FIG. Straight line l. Paper feed roller 2
The spring force of the paper feed pressure spring 46 (which is determined by this) is a constant value, without being affected by the paper feed force F It is then sent out to rollers 31 and 32.

2, the paper 26 is transferred one by one to the roller 31.
32, the uppermost paper 26 descends, and the paper feed roller 27 also descends accordingly. When the swing plate 44 swings to the position (II) in FIG. 44 separates the optical path of the photocoupler of the paper feed sensor 47, and the paper feed sensor 47 outputs a command signal for raising the paper feed table 24.

In response to the above-mentioned lift command signal, the control circuit 48 controls the motor 2
5 is driven again, and the swing plate 44 returns to the position (1) at 1, and the paper feed trays 24 are aligned one by one.

Hereafter, by repeating the steps described in section 2, the paper 26 is removed one by one.
They are sequentially fed into the printing mechanism 22.

As can be seen from the above, the paper feed tray 24 rises in steps, but the paper feed pressure acting on the paper 26 from the paper feed roller 27 is always constant, and the paper 26 is reliably fed to the last sheet. In addition, the printing mechanism z 21 is fed for one month, and the control of the motor 25 can be simply an on/off control.

In the above embodiment, one end of the shaft 36 of the paper feed roller 27 is tiltably and rotatably supported using the universal joint 37. However, it is also possible to use a universal joint at one end of the shaft 36. Instead, the shaft V-foot 36 and drive shaft 39 are integrated, and the adjustment is 1.
It may also be supported by a U-bearing so that it can be moved slightly and rotated.

At this time, the puff crush between the gear 40 and the segment gear 42 changes. Further, since a reaction of the driving force of the gear 40 occurs on the shaft 36, the fulcrum 43 of the temporary swing 44 should be installed on a straight line along the direction of the resultant force of the Sabaki reaction, the paper feeding reaction, and the driving force reaction. For example, as in the above embodiment, the paper feeding pressure can be kept constant.

Further, as the paper feed sensor 47, various configurations may be used, such as using a photocoupler (instead, a microswitch).

The present invention is not limited to automatic mimeographing machines, but can be widely applied to other paper processing devices such as copying machines.

As is clear from the detailed description above, the present invention
In a conventional elevator-type paper feed mechanism, even if the top level of the paper stacked on the paper feed table changes, the paper feed pressure that acts on the paper from the paper feed roller is not affected by the driving force of the paper feed roller. Since the shaft of the paper feed roller is supported at the same position, the top level of the paper changes slightly (7), but the paper feed pressure remains fairly constant, and even when the paper feed tray is raised roughly, the paper feed does not change. There is no performance deterioration, and since only one paper feed roller is required, even thin paper can be reliably fed without wrinkles. In addition, the paper feed tray can be controlled simply by turning on the motor.

Off control is sufficient, and the control mechanism for the paper feed tray can be made extremely simple.

[Brief explanation of drawings]

1 and 2 are respectively explanatory diagrams of a conventional paper feeding mechanism, FIG. 3 is an explanatory diagram of an automatic mimeographing machine equipped with an elevator type paper feeding mechanism according to the present invention, and FIG. 4 is an explanatory diagram of a conventional paper feeding mechanism. FIG. 5 is a perspective view showing the structure of an elevator type paper feeding mechanism of an automatic mimeographing machine, and is an explanatory diagram of the force acting on the paper feeding roller. 21... Paper feeding mechanism, 22... Printing mechanism, 24
...Paper feed tray, 25...Motor, 26...
Paper, 27... Paper feed roller, 28... Sabaki rubber, 36... Shaft, 43... Fulcrum, 44... Swing slope, 45... Aligning bearing,
46...Paper feed pressure spring. Patent applicant: Duplo Seiko Co., Ltd. Representative: Patent Attorney Mae Yamaboshi and two others Figure 1

Claims (1)

[Claims] (1) Stack papers on three paper feed trays that are movable in two downward directions, lift the paper feed tray in steps, and press the leading edge of the top sheet of paper against the paper feed roller. In the elevator type paper feeding mechanism, the paper is fed one by one to the paper processing section from between a lever paper feeding roller and a double feed preventing LL double feed roller member provided at the lower part of the elevator paper feeding mechanism. In order to enable the paper roller to follow the level of the uppermost sheet of paper, a shaft support member is provided to support the shaft of the paper feed roller described above, and the shaft support member has a contact portion between the paper feed roller and the paper. a paper feed reaction that acts in the tangential direction of the paper feed roller in a direction opposite to the direction of movement of the circumferential surface of the paper feed roller; and An elevator type feeder characterized in that a support point of the shaft support member and a fulcrum of the shaft are provided on a line along the direction of the resultant force of the Sabaki reaction acting in the opposite direction to the direction of movement of the circumferential surface. paper mechanism.